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| Merck Chemical Index says you can dissolve 1 gram of Urea in 1 ml of water. 1 ml of water weighs one gram. So you can dissolve 1 pound of urea in 1 pound of water, seems like a 50% solution. Pure Urea is 46.65% N so that gives you a 23.33 % N solution. To get to saturation it may take lots of stirring and warmer than room temperature water because going into solution will cool the water and slow the process. So much so that urea and water are used to make a quick chilling cold pack for medical treatment.
I know its done commercially because the liquid we buy as 28 or 32% has considerable Urea in the solution.
http://www.ehow.com/how_8360964_dissolve-urea.html says for the home gardener to warm up the water first.
http://en.wikipedia.org/wiki/Urea says
" In irrigated crops, urea can be applied dry to the soil, or dissolved and applied through the irrigation water. Urea will dissolve in its own weight in water, but it becomes increasingly difficult to dissolve as the concentration increases. Dissolving urea in water is endothermic, causing the temperature of the solution to fall when urea dissolves."
wiki copied that paragraph and more from this Urea label:
http://www.ivorychem.com/products/UREA46.pdf
Gerald J. | |
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mixing urea with water?
